Gear-wheel



(No Model.)

m E m HF HW m H W Patented Nov. 26, 1889.

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N. PETERS. Plwlo-Lilhcgmpher. Waxhinglou 11v 0.

U NIT-El) STATES PATENT OFFICE.

WILLIAM N. WHITELEY, or SPRINGFIELD, OHIO.

GEAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 415,755, dated November26, 1889..

T0 aZZ whom it may concern.-

Be it known that I, \VtLLIAM N. NHITELEY, a citizen of the UnitedStates, residing at Springfield, in the county of Clark and State ofOhio, have invented certain new and useful Improvements in CastMalleable Iron Gear Vheels and Pinions; and I hereby declare thefollowing to be such a full, clear, and exact description thereof aswill enable any person skilled in the art to construct the same,reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates generally to the construction of gear wheels andpinions, particularly when the same are made of cast malleable iron; andits objects are, first, to construct gear-wheels, pinions,sprocket-wheels, &c., of such form as to be capable of being thoroughlyand properly annealed, and at the same time to possess the requisiterigidity and strength; and, second, to provide suitable openings throughthe rim between the teeth, through which dirt, straw, grass, or otherclogging matter may pass freely out when coming in contact with theteeth of the op: posite wheel or pinion.

My invention is in the nature of an improvement upon the present form ofsuch gear-wheels,pi11ions, and sprocket-wheels, and is hereinafter fullydescribed, and fully illus trated in the drawings hereunto annexed.

Heretofore one of the objections to casting gears of malleable iron hasbeen that certain parts were of much greater thickness than others, andwere therefore not capable of being thoroughly annealed; second,malleable iron being of much greater density than ordinary grey iron acasting made of it shrinks much more in cooling, and therefore demandsgreater care in the even distribution of metal and in the form of thepattern, in order to insure a casting of proper form and free fromdistortion; third, in gears of even a moderately-wide face, when used inagricultural machinery, mills, and many other situations where they weresubjected to the presence of dirt, grass, straw, or other like material,have caused much trouble from clogging by such matter wedging itselfbetween the teeth, which greatly impeded their free operation andefficiency and often rendered them entirely inoperative.

In my improved form of constructing gears the first objection is met byso forming the pattern that a uniform thickness of metal is secured inall parts of the casting, by which they may be uniformly and thoroughlyannealed. The second objection-*that of distortionis obviated by thepeculiar form of the rim and teeth, whereby they form, as it were, acontinuous band of corrugated iron, the corrugations serving to form theteeth.

The third obj ec'tion-thatof clogging-is overcome by forming through therim suitable openings through which any dirt, straw, or other cloggingmatter may pass, thus relieving the teeth from these obstructions.

In the drawings, Figure 1 is a perspective view of a spur gear-wheelconstructed after my improved form. Fig. 2 is a similar view of aninternal gear for attaching to the arms of a larger wheel. Fig. 3 is anelevation.

Similar letters refer to like part-s in the several views.

Referring to the drawings, my-form of construction is as follows, viz:The hub is formed of an equal thickness of metal on all sides, includingthe keyway b, a projecting ridge to being formed for' that purpose. Thearms may be divided as shown in Fig. 1 in cases where a wide face isrequired, or made in a T- shaped section, as in Fim' 3, care being takento have an equal thickness of metal in all parts. Through the rim areopenings 0 0, made between the teeth, through which all dirt, straw,grass, or other clogging matter may freely pass when coming in contactwith the teeth of an opposite wheel or pinion. The teeth are eachrecessed at the back, as shown at (Z (Z, thus giving them somewhat of aU- shaped section, and forming of the teeth and rim a continuouscorrugated band of metal, the corrugations providing amply for the greatamount of shrinking always occurring in the rim of a cast-wheel, andparticularly so when cast of malleable iron.

Internal gear-wheels or rims to attach to the arms of a larger wheel-as,for instance, a mowin g-m achine wheelare constructed, as

shown in Fig. 2, with a web 6 at the ends of the teeth, or, foraffording a better opportuy for contractien din he W9 m y be omitted.Openings 0 c are the same as for an external or spur gear. Spur-pinionsmay be formed with a double series of openings 0 0, one series on eachside of the central web or flange, or said flange may be at one end ofthe teeth, and only one series of openings double the length may besubstituted, substantially as shown in Fig. 2, such flange, however,being formed with the usual central hub and bearing, and not having theperipheral rim shown in said figure.

Having thus described m invention and pointed out w e my improvem tdiifers constitute the teeth, substantially as shown 20 and described.

WILLIAM N. VVHITELEY.

\Vitnesses:

43 BEliRIGQ, FRED STATE.

